Unit 4
A C T I V I T Y 19
AC TIVIT Y
20 MIN
Polygons
CLASS
Display overhead pattern blocks for a triangle, a square, a trapezoid, a rhombus, and a
hexagon. Each of these blocks is a polygon. A polygon is a shape formed of
three or more sides and angles.
Use after
Unit 4, Session 3.3
Vocabulary/Vocabulario
polygon/
polígono
quadrilateral/
cuadrilátero
vertex /
vértice
square/
cuadrado
rhombus/
rombo
trapezoid/
trapecio
triangle/
triángulo
hexagon/
hexágono
pentagon/
pentágono
octagon/
octágono
Draw a quadrilateral on the board. This polygon is called a quadrilateral.
How many sides and angles does it have? The point where sides meet is called
a vertex. Write quadrilateral under the figure and label a side, an angle, and a vertex.
I am showing pattern blocks for three different quadrilaterals. The orange one is
a square , the blue one is a rhombus, and the red one is a trapezoid.
How are the square and rhombus the same? How are they different?
Students might say:
“They both have sides that are all the same length.”
“The rhombus does not have square corners.”
On the board, draw and label a square, a rhombus, and a trapezoid. Mention that
a square is a special type of rhombus because it has all square corners.
Materials/Materiales
• pattern blocks (overhead and
student)/
bloques de patrón
(en transparencias y para los niños)
• Activity 19 Master (see below)/
Actividad 19 (ver abajo)
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Un i t 4
Activity 19
MASTER
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Perimeter, Angles, and Area
NOTE Students identify polygons used
in real-world situations.
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Not all polygons have four sides. How many sides does the green block have? It is
a triangle. How many sides does the yellow block have? It is a hexagon. Polygons
with five sides are called pentagons, and polygons with eight sides are called
octagons. On the board, draw and label a triangle, a hexagon, a pentagon, and
an octagon.
Distribute pattern blocks to students. Ask them to trace around each block on their
paper and write the name for each. Then have them sketch and label a pentagon
and an octagon. Have them save their papers for reference when completing the
Activity 19 Master.
If students are familiar with parallel lines, have them point out parallel sides in a
square, rhombus, and trapezoid.
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In the Activity 19 Master, students identify various polygons used in real-world
situations.
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DIFFERENTIATION : Suppor ting the Range of Learner s
Use after Unit 4, Session 3.3
Unit 4: Perimeter, Angles, and Area
Discuss with students how they might connect the polygon names with
their number of sides or angles. Help them, for example, to relate triangle to tricycle,
quadrilateral to quadruplets, and octagon to octopus.
Session 3.3 (Squares, Rectangles, and Other Quadrilaterals)